Quote:
Originally Posted by AvenueBeads
If your running on a two stud the outer ring can still be closed blocking oxy which would be just like running a four stud with a pedal. Someone correct me if my logic is wrong?
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It depends on the way you have your oxy going in. If you have all your concentrators putting in the air to a common hose you can use a foot pedal on the four stud because the pedal has a bypass for the centerfire so you will not be cutting off the outlet of oxy.
If instead you have one concentrator feeding the centerfire directly and the second feeding the outer fire, you cannot shut off the outer fire either using a foot pedal or the knobs directly. You might be able to use the knobs to turn off the gas and then turn down the oxygen to a very low level and not backpressure your oxycon. That would probably depend on the oxycon brand on what the minimum flow needs to be.